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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/ui/ash/launcher/launcher_favicon_loader.h"
#include "ash/shelf/shelf_constants.h"
#include "base/logging.h"
#include "base/memory/weak_ptr.h"
#include "content/public/browser/render_view_host.h"
#include "content/public/browser/web_contents.h"
#include "content/public/browser/web_contents_observer.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "url/gurl.h"
namespace internal {
const int kMaxBitmapSize = 256;
////////////////////////////////////////////////////////////////////////////////
// FaviconBitmapHandler fetchs all bitmaps with the 'icon' (or 'shortcut icon')
// link tag, storing the one that best matches ash::kShelfSize.
// These icon bitmaps are not resized and are not cached beyond the lifetime
// of the class. Bitmaps larger than kMaxBitmapSize are ignored.
class FaviconBitmapHandler : public content::WebContentsObserver {
public:
FaviconBitmapHandler(content::WebContents* web_contents,
LauncherFaviconLoader::Delegate* delegate)
: content::WebContentsObserver(web_contents),
delegate_(delegate),
web_contents_(web_contents),
weak_ptr_factory_(this) {
}
virtual ~FaviconBitmapHandler() {}
const SkBitmap& bitmap() const { return bitmap_; }
bool HasPendingDownloads() const;
// content::WebContentObserver implementation.
virtual void DidUpdateFaviconURL(
int32 page_id,
const std::vector<content::FaviconURL>& candidates) OVERRIDE;
private:
void DidDownloadFavicon(
int id,
int http_status_code,
const GURL& image_url,
const std::vector<SkBitmap>& bitmaps,
const std::vector<gfx::Size>& original_bitmap_sizes);
void AddFavicon(const GURL& image_url, const SkBitmap& new_bitmap);
LauncherFaviconLoader::Delegate* delegate_;
content::WebContents* web_contents_;
typedef std::set<GURL> UrlSet;
// Map of pending download urls.
UrlSet pending_requests_;
// Map of processed urls.
UrlSet processed_requests_;
// Current bitmap and source url.
SkBitmap bitmap_;
GURL bitmap_url_;
base::WeakPtrFactory<FaviconBitmapHandler> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(FaviconBitmapHandler);
};
void FaviconBitmapHandler::DidUpdateFaviconURL(
int32 page_id,
const std::vector<content::FaviconURL>& candidates) {
// This function receives a complete list of faviocn urls for the page.
// It may get called multiple times with the same list, and will also get
// called any time an item is added or removed. As such, we track processed
// and pending urls, but only until they are removed from the list.
UrlSet new_pending, new_processed;
// Create a map of valid favicon urls.
std::set<GURL> urls;
std::vector<content::FaviconURL>::const_iterator iter;
for (iter = candidates.begin(); iter != candidates.end(); ++iter) {
if (iter->icon_type != content::FaviconURL::FAVICON)
continue;
const GURL& url = iter->icon_url;
if (url.is_valid())
urls.insert(url);
// Preserve matching pending requests amd processed requests.
if (pending_requests_.find(url) != pending_requests_.end())
new_pending.insert(url);
if (processed_requests_.find(url) != processed_requests_.end())
new_processed.insert(url);
}
pending_requests_ = new_pending;
processed_requests_ = new_processed;
// Reset bitmap_ if no longer valid (i.e. not in the list of urls).
if (urls.find(bitmap_url_) == urls.end()) {
bitmap_url_ = GURL();
bitmap_.reset();
}
// Request any new urls.
for (std::set<GURL>::iterator iter = urls.begin();
iter != urls.end(); ++iter) {
if (processed_requests_.find(*iter) != processed_requests_.end())
continue; // Skip already processed downloads.
if (pending_requests_.find(*iter) != pending_requests_.end())
continue; // Skip already pending downloads.
pending_requests_.insert(*iter);
web_contents_->DownloadImage(
*iter,
true, // is a favicon
0, // no maximum size
base::Bind(&FaviconBitmapHandler::DidDownloadFavicon,
weak_ptr_factory_.GetWeakPtr()));
}
}
bool FaviconBitmapHandler::HasPendingDownloads() const {
return !pending_requests_.empty();
}
void FaviconBitmapHandler::DidDownloadFavicon(
int id,
int http_status_code,
const GURL& image_url,
const std::vector<SkBitmap>& bitmaps,
const std::vector<gfx::Size>& original_bitmap_sizes) {
UrlSet::iterator iter = pending_requests_.find(image_url);
if (iter == pending_requests_.end()) {
// Updates are received for all downloads; ignore unrequested urls.
return;
}
pending_requests_.erase(iter);
// Favicon bitmaps are ordered by decreasing width.
if (!bitmaps.empty())
AddFavicon(image_url, bitmaps[0]);
}
void FaviconBitmapHandler::AddFavicon(const GURL& image_url,
const SkBitmap& new_bitmap) {
processed_requests_.insert(image_url);
if (new_bitmap.height() > kMaxBitmapSize ||
new_bitmap.width() > kMaxBitmapSize)
return;
if (new_bitmap.height() < ash::kShelfSize)
return;
if (!bitmap_.isNull()) {
// We want the smallest icon that is large enough.
if (new_bitmap.height() > bitmap_.height())
return;
}
bitmap_url_ = image_url;
bitmap_ = new_bitmap;
delegate_->FaviconUpdated();
}
} // namespace internal
////////////////////////////////////////////////////////////////////////////////
LauncherFaviconLoader::LauncherFaviconLoader(Delegate* delegate,
content::WebContents* web_contents)
: web_contents_(web_contents) {
favicon_handler_.reset(
new internal::FaviconBitmapHandler(web_contents, delegate));
}
LauncherFaviconLoader::~LauncherFaviconLoader() {
}
SkBitmap LauncherFaviconLoader::GetFavicon() const {
return favicon_handler_->bitmap();
}
bool LauncherFaviconLoader::HasPendingDownloads() const {
return favicon_handler_->HasPendingDownloads();
}
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